User Manual

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Ford Historic Diagnostics
5
If no problems exist, Code 11 or 111 will be
displayed.
If vehicle problems exist, codes are set.
Use
83'2:1 arrow keys to view codes.
Write down codes for reference.
When done, press %$&. to return to the Ford Function List screen.
Computed Timing Check (1984-1991 EEC-IV Vehicles)
This option of the KOER Read Codes function allows you to check both the
“Base” engine timing (no computer adjustment) and the ability of the computer to
control spark advance.
✓ This does not apply to 7.3L diesel vehicles.
Connect a Timing Light to the vehicle in accordance with the manufacturer’s
instructions. (For 2.3L dual plug engines, use exhaust side plug. Refer to ignition
system section in vehicle service manual for specific instructions.)
Select Computed Timing and press
(17(5 .
Follow the instructions step-by-step.
Failure to perform these steps may set a
false DTC in the PCM — observe the
display.
Avoid Cooling Fan! It May Turn On During Test.
1) Set Parking Brake.
2) Transmission In Park Or Neutral.
3) Turn A/C Off.
4) Start Engine — Let Idle Until Hot.
5) Turn Ign Key Off.
6) Wait 10 Seconds. Start Engine — Let Idle.
7) If Vehicle Has A Manual Transmission, Release Clutch.
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CAUTION